Chuck



(Modelf) v O. E. ABRAMS.

CHUCK.

No. 435,475. Patented Sept. 2, 1890.

1%- A I "'u l wue wtoz @313 25/; aflozmeq UNITED STATES PATENT OFFICE.

CHARLES E. ABRAMS, OF CHATHAM, NEXV YORK.

CHUCK.

SPECIFICATION forming part of Letters Patent No. 435,475., datedSeptember 2, 1890.

Application filed February 5, 1890. Serial No. 339,256. (Modeh) To allwhom it may concern.-

Be it known that I, CHARLES E. ABRAMS, a citizen of the United States,residing at Chatham, in the county of Columbia and State of New York,have invented certain new and useful Improvements in Chucks; and I dodeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

This invention relates to certain new and usefulimprovements in chucks;and it has for its object, among others, to provide an improved chuck offew parts which shall be most efficient in operation and not liable toget out of order. I also provide simple means for locking the parts inany desired position.

Other objects and advantages'of the invention will hereinafter be madeapparent, and

the novel features thereof will be specifically pointed out in theappended claims. The novelty resides essentially in the peculiarcombinations and the construction, arrangement and adaptation of parts,all as more fully hereinafter described, and shown n the drawings.

The invention is clearly illustrated in the accompanying drawings,which, with the letters of reference marked thereon,form a part of thisspecification, and-in which- Figure 1 is a perspective view of myimproved device. Fig. 2 is a like view of the several parts composingthe device separated, but shown in their relative positions. Fig. 3 is across-section through the completed device.

Like letters of reference indica to like parts throughout the severalviews.

The chuck is applicable to various uses, such as in a lathe or upontool-handles.

In the drawings I have shown two differout forms of devices to which itis applicable. All the essential features remain the same, the onlychange or difference being in the shape and character of the shank.

Referring now to the details of the drawings by letter, A designates theshank, which may be of any desired form, either as shown in Fig. 1 or asshown in Fig. 3, the change in form being such as is required to adaptto the different uses to which it is to be put. The form of shank shownin Fig. 3 is designed-for use with an ordinary bit-stock, that in Fig. 1for any other use being provided with a springarm a,having a notch atthe free end, as shown in said figure, the use of which will be readilyunderstood, being a Well-known construction for holding devices of thischaracter in their handles. This shank carries a disk or head B,provided upon its outer face with a diametrical channel or groove 1), inwhich the holding-jaws C are designed to move. These channels areundercut, as shown, and the shanks of the holding-jaws are inverselyformed to engage the said undercut channels or grooves in such a mannerthat while the jaws are free to move lengthwise of the channels they areprevented from accidental withdrawal or displacement therefromvertically 'or sidewise. These jaws may have roughened grasping-faces,if desired; but such provision will not ordinarily be necessary.

The disk is provided with a central passage-way c, which enters for adistance in the shank, as shown in the drawings, to receive a portion orend of the instrument or article held by the jaws.

D is the means for operating the jaws. It consists of adisk havingaright-angled flange or rim d, as shown in Fig. 2, the outer edge of thedisk and rim being milled or otherwise roughened to afford a bettergrasp for the hand by which it is designed to be rotated. The face ofthe disk is formed with two oppositely-extending slots 6, beginning atopposite sides of the disk and extending upon curyed lines toward thecenter, where they unite, as shown. These slots have each a short and along side, both of which are cam-shaped, as shown,which in practiceengage the holdingjaws, and as the disk is revolved the camsforce thejaws toward or away from each other. The jaws are cut away upondiagonally-opposite edges, as shown at f, so as to form a proper bearingfor the sides of the cam-shaped slots. The convex inner faces providefor the working of the tongues of the diskD, as will be readilyunderstood. tween the two points of the disk between the The passage-waybe-.

slots affords a free unobstructed passage through the stationary diskand through the shank.

The upper edge of the stationary disk is provided with an annularshoulder 71, on which the rotary disk is designed to rest, and at onepoint the stationary disk is provided with a depression j, in whichworks the catch m, having a portion workingin a deeper depression andresting upon a spring H locatedtherein, the catch having a milled edgeand aportion 'n, which is designed to engage back of the rim or flangeof the rotary disk, and, being normally pressed outward by the saidspring, serves to hold the rotary disk in its adjusted position. Thecatch an engages back of the rim of the disks D and B and the notches j.The parts are readily assembled by first engaging the jaws in theirchannels and then placing the disk D in position. The portion of the rimor flange of the rotary disk over which this catch works is notched, asshown at '0, and these notches may be graduated or marked so as toreadily determine how far to move the disk to accomplish the desiredadjustment.

The operation is simple and will be readily understood. The jaws are tohold the implement. They are advanced or moved to ward each other bysimply moving the catch inward, so as to release the rotary disk, when,by revolving the latter, the cams acting upon the shanks of the jawscause them to move inward or outward, according to the direction inwhich the disk is moved. The catch is automatic, locking the parts inposition as soon as it is released.

The screws t t, which are set within the countersunk recesses uu in theupper face of the disk or head B, adjacent to its outer edges, serve tolock the disk D against vertical displacement, as will be readilyunderstood.' When the screw-heads have been turned so as to engage thegroove formed within the inner edge of the disk, the parts will belocked against displacement, and when the screws are turned partlyaround, so as to disengage their heads from the groove in the jaws D,the said disk may be readily disengaged from the head or disk B. Forthis purpose the heads of the screws are made segmental, as shown. Therounded portions f are extended below the disk D to permit of the readyassembling of the parts.

What I claim as new is- 1. The combination, with the shank and its head,of the rotary disk formed with camshaped slots and the jaws, the shanksof which are cut away upon diagonally-opposite edges, as set forth.

2. The combination, with the shank and its head, of the jaws, the rotarydisk formed with cam-shaped slots, and a lockingcatch on the head of theshank, substantially as described;

3. The combination, with the shank and its head, of the jaws, the rotarydisk formed with cam-shaped slots and annular flange, and thespring-actuated catch working in guides in the head of the shank andengaging the flange of the rotary disk, substantially as shown anddescribed.

In testimony whereof I afi'ix my signature in presence of two witnesses.

CHAS. E. ABRAMS. Witnesses:

CHARLES M. HARMON, JOHN B. TRAVER.

